Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37fdf3c9849bdb6…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 08:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87afd856913ba5d935668bf95a5f8b81 SHA-1: bec6cbf06e9d2c1aaa5418c7a57629606d3cb093 SHA-256: a37fdf3c9849bdb69a6984a6c2f59d5c469cab3bb79eae7882e94ad8461bfc2d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to a link farm hosted on static.usrfiles.com. One prominent link, 'https://ttraff.cc/wix?keyword=utah+drivers+test+study+guide', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Utah drivers test study guide', suggesting a lure to entice users to click the malicious link. No scripts were extracted from this sample.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=utah+drivers+test+study+guide
    • https://static.usrfiles.com/ugd/1b8612_cd61262014714beda2acd71e41e6fe40.pdf
    • https://static.usrfiles.com/ugd/e8506d_b7137d034388483eba46324c3d8e9e40.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b75bd4ce4f7415a8768c37507cc0938.pdf
    • https://static.usrfiles.com/ugd/b7082a_c06d8320ad964779ad04fc2ce2301a3f.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/makomimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/49970767507.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/84581533203.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/kefewasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/newixafezupavamudina.pdf
    • https://static.usrfiles.com/ugd/b8c837_21c593f5f4f64c7da2d6e7cdad1e0701.pdf
    • https://static.usrfiles.com/ugd/c7a620_56bafd63e7634ee68680733d8fc106cd.pdf
    • https://static.usrfiles.com/ugd/136d07_0f8db1bd7ca347c8bc7b1d16f3507b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d05008204cc4b7b92e86b7602ae428b.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e593bc5c9b4d1da50ad1c063c1cd0a.pdf
    • https://static.usrfiles.com/ugd/d1c05f_a4c63a369d754793af3e5793e0f43b6d.pdf
    • https://static.usrfiles.com/ugd/0bcf16_8f1fff20f942463a82d04bbc1d9a98ae.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bc.bin
37a261d8ea6f95cda4d1a2d4c6d629f3d3c9150ca7ab7bf8fce216ce19dec16a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 5208 bytes
font_01_sfnt_off00007a79.bin
15bd2f1028b95ae3944eddba00b67f41162d4c875c4ebd4587d62d636a9650a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A79 10532 bytes

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